Table 2
Distance of the known H II regions.
| Name | ℓ | b | CO velocity | Distance (B74) | Distance (C85) | Recent distance | Method | References |
| (°) | (°) | (km s-1) | (kpc) | (kpc) | (kpc) | see notes | ||
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) |
|
|
||||||||
| BFS 52 | 191 90 |
+085 |
7.3 ± 0.5 | ··· | ··· |  / |
p∗ | 1/2 |
| SH 2-253 | 19223 |
+359 |
14.4 ± 0.5 | ··· | ··· | 5.1 ± 1.5 | s | 3 |
| SH 2-254 | 19249 |
–015 |
7.5 ± 0.7 | 1.12 ± 0.92 | 2.5 |
|
p† | 2 |
| SH 2-255 | 19264 |
–001 |
7.5 ± 0.7 | 0.88 ± 0.80 | 2.5 |
|
p | 2 |
| SH 2-256 | 19262 |
–013 |
7.5 ± 0.7 | ··· | 2.5 |
|
p† | 2 |
| SH 2-257 | 19261 |
–007 |
7.5 ± 0.7 | 1.34 ± 0.95 | ··· |
|
p† | 2 |
| SH 2-258 | 19273 |
+005 |
7.5 ± 0.7 | ··· | 2.5 |
|
p† | 2 |
| SH 2-259 | 19294 |
–058 |
22.8 ± 0.5 | ··· | 8.3 | 8.9 ± 2.7 | s | 3 |
| SH 2-261 | 19410 |
–190 |
··· | 0.90 ± 0.80 | 2.3/2.1 | 1.6 ± 0.5 | s | 3 |
| SH 2-266 | 19566 |
–008 |
31.2 ± 1.1 | ··· | ··· | 2.0 ± 0.6 | s | 3 |
| SH 2-267 | 19620 |
–120 |
··· | ··· | ··· | ~4.2 | s | 4 |
| SH 2-268 | 19640 |
–280 |
4.8 ± 0.5 | ··· | ··· | 1.3 ± 0.4 | s | 3 |
| SH 2-269 | 19640 |
–170 |
17.5 ± 0.7 | 1.88 ± 0.80 | ··· |
|
p | 5 |
| SH 2-270 | 19684 |
–311 |
25.6 ± 0.4 | ··· | ··· | 6.8 ± 2.3 | k | 3 |
| SH 2-271 | 19777 |
–231 |
20.5 ± 0.5 | ··· | ··· | 5.1 ± 1.1 | s | 3 |
| SH 2-272 | 19781 |
–228 |
20.5 ± 0.5 | ··· | ··· | 5.1 ± 1.1 | s | 3 |
Notes. The source names are listed in Col. (1) and the central coordinates are in Cols. (2) and (3). The radial velocities of the peak CO emission associated with the H II regions are given in Col. (4). Columns (5) and (6) are the distances in Berkhuijsen (1974, B74) and Caswell (1985, C85). The distances taken from the recent literature are listed in Col. (7) with the distance measurement method given in Col. (8), and the references are given in Col. (9).p: parallax; p∗: associated with SH 2-252 or SH 2-254; p†: SH 2-254 to 258 are regarded to have the same distance; s: stellar distance; k: kinematic distance.
References. (1) Reid et al. (2009), (2) Rygl et al. (2010), (3) Russeil (2003), (4) Lahulla (1987), (5) Honma et al. (2007).
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